The Swiss verein model for law firm combinations has benefited a handful of global firms looking to sustain growth and increase size and scale, but the fact that only a small number of firms have combined using the verein structure has experts wondering whether it is still a viable business strategy.

Large firms such as Dentons, DLA Piper and Baker McKenzie embraced the verein approach in the early part of the 21st century, using the model to place them in the upper echelons of the Am Law 100. Other recent transatlantic mergers, however, including the combination between Allen & Overy and Shearman & Sterling that created A&O Shearman and the merger between Herbert Smith Freehills and Kramer Levin Naftalis & Frankel to become HSF Kramer, have avoided the Swiss verein route, leading to questions over whether the model is losing luster.